Manifolding ribbon mechanism



561354, 1.951 G. F. MORRIS 2,566,953 l MANIFOLDING RIBBON MECHANISMFiled July 29, 1947 5 :shees-sneez 1- ATTORNEY G.- F. MORRIS MANIFOLDINGRIBBON MECHANISM sept; 4, 1951 5 SheetS-Sfleet 2 Filed July 29, 1947ATTORNEY Sept. '4, 1951 y G. FI MORRIS MANIFOLDING RIBBON MECHANISNIFiled July 29, 1947' 5 Sheets-Sheet 3 lNvENToR afi-0R65 E MORE/ Et lATTORNEY Patented Sept. 4, 1.951

MANIFOLDING RIBBON MECHANISM George F. Morris, Etobicoke, Ontario,Canada, assignor .to International Business Machines Corporation, NewYork, N. Y., a. corporation of New York Application July 29, 1947,Serial No. 764,447

l -This invention relates to typewriting machines and in particular toribbon feeding and reversing mechanisms.

The primary object is to provide a, simple and improved ribbon reversingmechanism.

Another object is to provide a ribbon mecha- Other objects of theinvention will be pointed out inthe following description and claims andillustrated inthe accompanying drawings, which disclose, :by way ofexample, the principle of the invention andthe best mode, which has beencontemplated, of applying that principle.

'In the drawings:

. Fig. 1 is a plan view of the carriage of a typewriting machine showingthe present invention attached thereto.

Fig. 2 is a front elevation.

Fig. 3 is a perspective view of the carriage.

Fig. 4 is a vertical section on the line 4 4 in Fig. 2.

Fig. 5 is a vertical section on the line 5 5 in Fig. 2.

Fig. 6 is a large scale side view of the feed pawls and ratchets.

. Fig. 7 is a vertical section on the line 1 1 in Fig. 6.

Fig. 8 is a view similar to Fig. 6 of a modified form of reversingmechanism.

Fig. 9 is a vertical section on the line 9 9 in Fig. 8.

10 is a large scale vertical section on the line Ill-I0 in Fig. 2.

The invention is shown as applied to the carrlage of the Well knownE1ectromatic" electric power-operated typewriter. It will be understood,however, that this has been done purely for convenience in illustratingthe invention and that the ribbon mechanism may be applied to othertypewriters whether manual or power operated or to other carriages, suchas accounting machine carriages with only minor alterations notinvolving a change in the principle of the invention.

The reference numeral l0 in Fig. 3 generally designates the typewriterof which only a small portion of the framework is shown and which 7Claims. (Cl. 197--153) 2 inking ribbon i2, the latter being supported bythe usual ribbon vibrator I3 and ribbon guides.

le. The carriage of the typewriting `machine comprises the side platesl5 (Figs. 1 to 4) which are rigidly joined together in a well knownv wayand mounted on the usual track (not shown) so as to be capable ofmovement to right and -le'ft (Figs. l and Z). Rotatably mountedin theside plates i5 is the usual platen assembly I6 including the hne spaceratchet Hand the platen rotating knobs I8 and this assembly isvremovably mounted in open notches lain the plates lI5 and held thereinby the usual spring pressed latches I9.

Secured to the carriage side plates I5 are the supporting plates 20(Figs. 1 tofi) fwhich are roughly triangular in shape. The right handplate 26 has secured therew an offset bracket 2i which. together withthe left hand plate 20. rotatably supports a shaft 22 on which isloosely mounted the lei't hand ribbon spool 23, a suitable collar 24preventing the spool 23 from sliding to the right (Figs. 1 and 2) on theshaft 22. The right hand end of the shaft 22 is received in a flangedbushing 25 (Figs. 2 and l0) which is rotatable in the bracket 2| andretained therein by a collar 26, the set screw of which passes throughthe bushing 25 and engages the shaft 22. The bore of the bushing 25loosely receives the end of a thumb screw 21 having a threaded shoulder21a screwed into a hole' in the 'right hand plate 20. On the shank ofthis thumb screw 2l the right hand ribbon spool 28 is freely rotatable.It will .be seen that the thumb screw 2l may be unscrewed and removed,thereby permitting the ribbon spool 28 to be removed from the machine.

In order to establish a driving connection between the shaft 22 and thespool 28 the flange 25 is provided with two diametrically opposite pins25a which register with holes in the side ange of the ribbon spool 28.Suilicient clearance is provided between the plate 20 and the bracket 2|to permit the ribbon spool 28 to be disengaged from the pins by alateral movement to the right (Fig. l) after removal of ,thumb screw 21.

The feeding of the ribbon and the reversal of the feeding movement isaccomplished by'means of mechanism which is mounted between the lefthand ribbon spool 23 and the left hand plate 2D. This mechanism includesthe feed ratchet 29 (Figs. 1 to 4, 6, and 7) which is fixed to the leftside of the spool 23 and conveniently has eighteen includes the usualtype guide Il and Ordinary teeth and a similar ratchet 30 fixed to'theleft 3 hand end of the shaft 22 adjacent the left hand plate 20. Looselymounted on the shaft 22 is a hub 3| (Figs. 5, 6 and 7) having twooppositely facing shoulders 3| a on which are mounted the controlratchets 32, 33, each of which has ten teeth, these ratchets .beingsecured to the hub 3| by means of the screwg 3|b of which three areprovided foreach ratchet in staggered relation, whereby the hub 3| andthe two ratchets 32, 33 form an integral unit loose on shaft 22.

Loosely rotatable on the periphery ofthe h ub clutch arm 34 which isprovided; with, a; slotl 34a (Fig. 5) within which is mdemmomined.mieten ball or roller 34o engaging-,the periphery-.cfs huh.

3|. The slot 34a becomes progressively shallower from the top to bottom(Fig. 5l sollthat tivzhentl-1eu clutch arm 34 is rotatedcountercloc'zkvv'isev in Fig.v 5 the wall of the slot, assisted by aspring34c,

tends to jam the ball or @ller 34h against the hub e;

riverain neared oeopppsnesiees-.Qf neem I 34 are' the feekflinawlaft-'utl (Figs- 1 tn i whieh are interconnected@ tbeiaendsibrargkeshaped 2119.31 (Elige 1) lcpselsateceivedia holesiln .the noses ofthe pawls and serving as an anchor for a commen eeetalieaepriaeefettlienewlsithe other. easl, 01` thefeprirlggbelnealithnredtga hook. eepureltothe ideeen-the elliteliiarm The springvit.tenciatoiepaasatlieanniivzith raten: eis 2 9 .and 32. a11Q-t12ef9ewh 3ra with tlieratehets 3 and 331. respeetivelmthe ravvisbeine.twicle, e'nouelifor thlannrnpsa i The teeth. 0.1i Le.. reichte-te 32,.iarestaseered S0 that eaelltegtll Q13 Queja aligned, axially: of. shaft22. with @paesi-mately, the; middle o f.. a toothepaee. QnitlieQtheriretchetso that in, side view the twe.rateliete.loolalilsetaingle2li-,tooth ratchet. 1

The ratchete- SZe are slielitlnlaraerin diam: eter thantheratelietailillt wherebyitispoesif ble for theratcaeis a2. tehoiamepavos es, .e

36 .clear of thejrfassgciatedgratehets29, 3 1 under; CertainConditleliS-L Tiberian-lati. areselectiveli7 controlledbrftlle.'retchetazi 3.3. through a pair of rbbenveelers 4&. 4I.- Eies 1 to 4iassociated with thgr-.ibbQn-snoplssand 28. resheutigel ly- The feeler.i4f! ,laseeureditofa shaft -42- wni cn is rotatable in the plates 29 andsecuremto-the Shaft, et il'aileltiheydiends-elae rateheteontrol neer 43The feeletleveal is essere@ to e sleeve 44 t0 which iealtaehesl asimilarfinger 4s. The feeler levers 43, 4| egtendrearwardly of the machine andnormally -rldeuponthe -coils of ribbon; on the sp0ols -23. 2,8,V wherebytheV levers 4|), 4| are lifted by thelacumulationsof ribbon. or a1-lowed to drop by, thennwinding of ribbon bythe respective` spools',theleyers being weighted at their ends for this'purpose. The controlinger 432-, is adapted to engage,izheteethoi; the ratchet 32 and thelinger 4,54 to engagethe-ratchet33- under certain conditionsA tovprevent retrograde` movement thereof.y

In order to understand the operation of theF mechanism jnst described itwill be'assumedthat a reversal in the ribbonfeeding mechanism hasY 4 isabout to commence winding as illustrated by Fig. 3 in which the righthand spool 28 is full; Figs. 4, 5, and 6 illustrate the condition of thevarious ratchets and pawls immediately after the reversal has takenplace and the mechanism has become operative to feed the ribbon on theleft hand spool 23,11;v will b e noted from these iigures that-.theratchet 32 is in such a. position as to enable the pawl 35 to engage theteeth of ratchet 23 whereas the opposite condition prevails with respectto theratchet 3U, owing to the fact that the 'teeth in the ratchets 32and 33 are staggered, the

paovl .3.6, being held out of engagement with the ratchet 30'. It-.wiltbe noted in Fig. 5 that the iinger\45',fwhich-is attached to the feeleriinger 40 for the left hand spool 23, is in the path of movey ment Q fatoothorrthe ratchet 32.

just taken place-land that'theleft handlspool 23- 75 "Let it be assumedthat the arm 34 is now 0sl cilla'ted a clockwise direction and restoredan angular distance slightly greater than the enga--- lar;distanoehetween two teeihin theratchetla allows; the. pawli 3.5i toengage. the next. sun-l ceeding tooth in a clockwise direction.onratchet 29.-v and`v on; theretilrn strokeo,f the arm 34, said ratchetand the, spool; 2 3; to which itA is attached WilLbe; rotated in, aycountellockwise; direction onetooth space; thereby feedingasmallamauntc-the rihbonomthespool..

- Whenthe arm 34; is.- oscilla-ted clockwise the ratchets 32 and 33follow.thearnn 34,. Thisiszdne to the combined effect of frictionbetweenthe hub 3L and arm 34;; thefriction between; the. clutch roller.34b,;the hub-3 1' and armi3 4; and tha-drag of the pawls 35, 36 on theratchets 32, 33. Hnwfever,. no relative displacement occursbetween thearm 3 4., and the ratchetsm and-.331;withthe re.. sultthat the-paw).- 3& ismaintainedi in| an. ele-- vated positionclear of: the teethfintheratchet 3.0,-:so that onthe return strokeof thearm34the ratchet 3 |kis.notaiected.

While the nger 45 is in the path. of: a toothdn theL ratchet,3 2 therewill exist-a clearance between such toothandthefendof the finger of.approximately the angular distance betweenftwoteeth, on the ratchet 29witntha result. that the tooth merelyL moves up to the-finger: 45:and;may move the-ratchets 32, frelative: tu-.thegarm 341an insignificantamount insufficient to disturb the relation between the: pac/:1. 36 and.thefratchet 30. Thus with each oscillation of the arm 34 the rib bonds.fedfon. to i the spool 23 .aridas this action continues the finger 45 isgraduallymovedinta clockwise direction.imtilzit'isecompletely clear ofthe ratchet 32. While this action is taking place the other finger 43;wilt be gradually permittedto drop, due to theunwindingiofethe.ribbon-fromthe SROQl 2.

When the arm 34 is fully restored as in Figs. 4, 5land-6lwitn-thezparts' operatingundertne above conditions, there will bea tooth-1in; ratclietzz33 justg clearfofgthegarc; traversed; by, the;.end of. the linger., 43"a nd, this -tooth, asthe arm 3.4.;isrocked;clockwisewill e trayel across-such and clock'.- Wee' a distaneefequaktoislightly mpref-thanY-the distance betweentwoqteethon theeratchetzm but..QWQS tO'ffaQt thithQ-,ngeit-S iS;A iillI-Sv time; quite a waysawayfrom-the rati/het 30,4 vnothing` will happen to changethe-vrelationfbetween 4the ratchets; 3 2, 33i and ther pawlsf 3 5; 36- andf theribbon'. Will- ;continue tofgfeed omthe spool 23;.

Ultimately the spool 28 will become exhausted there wil1be a pointfWhere thefinger 43 drop intoa positiontoe catch r, the; tooth of ratchetSilmentioned above and will assume a: p9eitloniike-theznger #l5- 1nEie-,- 4. n is quiteclear, that with the ratchet "33 in the position ofFig. 4 and with the finger 43 .now occupying the position occupied bythe iinger 45 in Fig. 4, the next oscillation of the arm 34 will causethe nger 43 to catch a tooth in the ratchet 33 and prevent said ratchet,and likewise the ratchet 32, from moving clockwise with the arm 34. Thusthere will be effected a displacement of the ratchets 32, 33 in acounterclockwise direction relative to arm 34 and this will cause thetooth which is holding the pawl 36 out of engagement with ratchet tomove out from under said pawl and permit it to engage the ratchet 30. Atthe same time a tooth of ratchet 32 will move underneath the pawl andelevate it out of engagement with the ratchet 29.

With the restoring movement of the arm 34 the tooth which engaged thelinger 43 will be backed away from the finger 43 and the samerelationship will now exist between the finger 43 and the ratchet 33 asexists in Fig. 5 between the iinger and the ratchet 32. Since the pawl36 now engages ratchet 30, the latter will be actuated a tooth space ina counterclockwise .direction upon the return of the arm, since theshifting movement which eiects the reversal in the feed of the ribbontakes place during the clockwise portion of the oscillation of arm 34.It is thus apparent that there ls no risk of locking or jamming the twopawls 35, 36, due to indefinite transition as sometimes happens withother feeding mechanisms.

Owing to the spacing of the teeth in the ratchets 32, 33, it isimpossible for both pawls 35 and 36 to engage their respective ratchets29 and 3|! simultaneously. Since the reversal takesplace on the forwardclockwise stroke of the arm 34, the ribbon is moved backwardly insteadof forwardly at the time of reversal so that the next impression of thetype will not vbe through the same portion of the ribbon. It is thusseen that the point reversal of the ribbon is clear-cut and sharp andthere is no chance that several impressions may be made through the sameportion of the ribbon during the reversal period as sometimes happenswith ribbon mechanisms in which tension is relied upon to eiect reversaland movement of the ribbon is blocked until enough tension can be builtup in the ribbon to render the reversing mechanism eiective.

In Figs. 8 and 9 there is shown a modified form of control mechanism foreffecting the reversal of the ribbon. In place of the ratchets 32 and 33there is provided a pair of cam plates 50, 5|. having cam lobes a, 5|a,respectively designed to cooperate with the pawls 52, 53. The cams 50,5| are pivotally mounted on an arm 54 by means of shouldered washerssecured to the arm 54 by means of screws 55a, the arm 54 and the washers65 being centered on the shaft 22 by a bushing 56. The cams 50, 5| areformed with shallow depressions 50h, 5|b receiving the balls 51 of adouble ball catch carried by a hole in the arm 54, a spring 58 common toboth balls urging them into the depressions 56h, 5|b. Each cam has twodepressions enabling it to be yieldingly held in either of two setpositions. The cams 50, 5| are interconnected by a pair of intermeshingpinions 59 which are pivoted on studs carried by the arm 54. The arm 54is bored to accommodate the pinions 59 and these bores intersect toprovide a space to permit the intermeshing of the pinions 59. Eachpinion meshes with suitable teeth formed in one of the 'cams 50, 5| andthe eiect of this construction lato' compel the cams tomove in'scissorsfashion whenever either one of them is given a displacement. The cams50, 5| are each provided with a single tooth designated 50c, 5|c (Fig.8), designed to cooperate with the lingers 45 and 43. respectively.

It will be noted in Fig. 8 that the parts are shown in the sameoperating condition as the parts in Fig. 4, it being assumed that thelinger 45 has lust been effective to reverse the ribbon to cause it tofeed on the left hand spool 23 as was assumed above in describing theoperation of the mechanism disclosed in Figs. 4 to 7. It will be notedthat, as in Fig. 4, the nger 43 will not be in a position to engage thetooth 5| c and that the tooth 50c is displaced away from the end 'of thefinger 45 approximately one tooth space-on the ratchet 29 whereby, whenthe arm 54 is oscillated clockwise, the tooth 50c will move up to engagethe nger 45 at about the end of the stroke of the arm 54 and will'haveno eiect on the relative positions of the cams 5|. 50.

In Fig. 3 the cam lobe 5 la is engaging the pawl 53 and holding it outof engagement with the ratchet 30 whereas the lobe 50a is clear of thepawl 52, permitting the pawl 52 to drive the ratchet 29. When thepositions of the fingers 43, 45 are reversed, as will take place whenthe right hand spool 28 becomes exhausted, the linger 43 will take theposition now shown by the nger 45 in Fig. 8 and catch the tooth 5|c,thereby preventing the cam 5| from following the arm 54. This causes thecam 5| to be displaced in a counterclockwise direction relative to thearm 54 withdrawing the lobe 5|a from underneath the pawl 53 andactuating the cam 50 in a clockwise direction relative to the arm 54,through pinions 59,' to move the lobe 50a underneath the pawl 52 andelevate the latter out of engagement with the ratchet 29.

In order to limit the scissors-like motion of the cams 50, 5| on the arm54 to a. distance equivalent to approximately a, tooth space on theratchets 29, 39, there is provided a stop pin 54a.

The arm 34 may be actuated by any suitable means such as a line spacelever mounted on the carriage. In the illustrative embodiment of theinvention it is preferred to connect the arm 34 by a link 66 to theusual line space slide 6| which is vertically guided and actuated, inthe manner disclosed in Patent 1,957,322, each time the platen i6 isline-spaced. The slide 6| carries a line space pawl 62 which coacts withthe line space ratchet as in said patent.

The usual line space control lever is replaced by an L-shaped lever 63which may be reached from the rear of the machine. This lever carriesthe usual pin 63a which functions in the usual way with a second lever64 to control the stroke of the pawl 62.

In order to 'prevent the ribbon spools 23, 28 from spinning when theyare unwinding, the brake fingers 'l0 are provided. These fingers arepivotally mounted on the studs 1| (Figs. 1, 3, and 4) and spring-urgedinto engagement with the edges of the spools 23, 28 'by means of springs12, the ngers 10 being provided with suitable pads of material, such asleather. Preferably, the brake fingers are wide enough to engage theedges of both spool flanges in each case.

For the purpose of guiding the' manifolding ribbon R across the writingline there is provided the ribbon guide bar 15 (Figs. 1 to 4) which isattached to the side arms 16 by means of the of the bar -56 are theribbon guide frames 18 in 7 whieh are :mounted :the a :ribbon iguiderollers .wand-.the vertical guide rollers .80. The ribbon vli. is ledfrom tthezriehthand spool 28 for- Hardly y.and downwardly .around fthe1-ight .hand 4.5'ro11er :1.8, thence crosswjse ofithe machine be.- tween:the 'rst two plies Aof vthe -rnanifold forms, then Y around thelefthandwertieal -roller 80 'back tothe right .b etvveenthe secondandthirdpliesof the. formssaroundfthe right handzrol-lers, thence back tothe .left between :the third and -fourth plies, ...around the .left.hand 45 -,=roller 5I-9, vand thence on-theribbon spool 33.Thissallows'three working stretches .of the gribboneforfthepurpose of:making three .copies besides the copy made with the main .ribbon .l2;as shown in rFig.

For fthe purpose .for .guiding :the manifold stationery .to lthe:ribbons :there f'is-fprovideda series of adjustable guides .generallylrlesignat'edfi .(Figs. 1 to 1-3), :designed to-aecommodatefseveraldifferent widths Tof-worksheet, wherebyitheoaek of manifoldstationeryfinayibe'madeluplof-strips of :different widths. *This guiding-means is -ad justably mountedconthe paper vtablefBZ -whichfis mountedinthe usual lway-onft-hestuds1flI. I'Any suita-hlaguidingfmeans maybeused.

The side .farms -16 are nivotaily mounted/at -83 (Figsslfan'd) inthe-plates 12m-each of which-is provided with-:ansoisetflug:20a-supporting the adjacent side .-,arm '16 :and engaged by -arspringu-rged latch B4 .ipivoted-on: the adjacent side arm 16. 4Thelatchesili maylbe released toraise-the assembly including thebar'l15-and.-theside arms, 16 to carry 4.the 'ribbon 1R: up .frombetween the plies of stationeryfto facilitate the insertionfof forms.

JWhile *..tbere have f been .shown -and described and :pointed.outfthefundamentabnovel features of- .the i.nvenl;ion,y asf apnliedftoapreterred embodiment, it Will be understood that various-omissionsiand.substitutionsfandchangesin: therform and detailsof .the deviceillustrated-.andI in its-operation maybe lmade bythoselsizilled inftheiart without. departing ."fromA the spirit of the. invention. ...Itis the intention, therefore, tofbellimited only-as indicatedsby. thescope of f-the'following claims.

What is ciaimedis:

1..A. ribbon .'mechansm.- comprising .a pair .of feed ratchets .pawls,r,one for..4v each ratchet, for imparting rotationto A:said ratchets;apair. -of c0ntrol...members, one forfoach -ratchet Yand-its associated.pau/1, .said control fmembers having projections coacting with-.said:pawlsland capable of holding said pawls; Qllt.: of'. 4driving-`relatiorrto said ratchets; means ,interconnecting Isaid membersincluding :1.a diierential gear-arranged so that movement of,either;,rnember molle the related pewl. out of driving .relation1witnits ratchet at the same time causes the-.othr-member to movetoe-positionpermittinezthesother pawl to have driving :engagement withits ratchet; and ribbon. controlled. smeansf for selec.- tlvely movingSaidoontrol. membersdn alternation.

- 2.4 A ribbon mechanism .eomnrisinsre pair; of; feed retohets.: :feedrewlsf. one ioreaehl .orsaid retehets; e pair of control .elements.retainF ably mounted adjacent one -oflsaid wis-,and movable toalternate-positions the. adi' acent pawlis engaged-with and disengagedtrom its associated ratchet..v respectively; including areversingygeantrain. interconnecting said elements whereby rotation-voi.either .element to .one .alternate position@ engage itsnewl with@associated ratchet coemels. other-.element '1.5 the sonnet.

to amore `izo the other .alternate .position .to rvdisengage theipawlior .said other element from the ratchet ior'saidother element,means for actuating said !pawls inunison, and ribbon controlled meansforoausing theactuating means to move said 'elements f-to -theiralternate positions .to thereby eiecta -reversal of the. ribbon.

3. In -oombination -with the carriage and platen .of .a typewritngmachine, a cross shaft mountedin said carriage yparallel .with saidplaten,.a-.pairof ,ribbon -spoolsat -theends of .said platen .andcoaxial with said shaft, .one of .said spoolsibeing fkeyedltofthe end ofsaid -sliafvtmeans tosupport-and.g-uidefaribbcn between said-spoolsand'alongfthe-writing-:line.on the platen; a-.pair of feed ratchets, onefixed-to said-shaftadjaoent thefloose.spool andthe other-secured totheloose spoola spaceddistanceifrom -theratchet fixed .to

said ;shaft,l .-a .rock Jarm journaled on `said vshaft betweenrsaidratehets, a -nai-r v4of Afeed -pawls oar.- riedlbysaid arm and coastingwith-said ratchets, meansfto oscillate'said arm; a-p-air or pawloon.-trol `members journaled on said shaft, one on each .side -of saidvarmadjacent one of said ratchets, each of said control members beingshapedl to l alternately engage `-and disensage `the pa-vlefor the ladjacent-ratchet Afrom said ratchet in twoaiternate--niovomentm ineensinterconnecting fsaidacontrol members whereby, nwf-hen eitherlone-movesto aA positionl to A-engage its--paW-l with the .associated--ratchet, -the other -control member will be moved-to disengagetheremaining pawlfiromoits' ratchet-ymeansto causesad control members' to`-oscillate with. said arm, and means to -senseoexhaustionof the.ribbon-from said .spools and including elements engageable with saidcontrolmembers, when a-spool becomes exhausted, -tdenable .anoscillation vof Ysaid arm to.-mo.ve theontrolme'mber for the exhaustedspool. to -pawlcengaging .position .4.- Theinvention set-forth in .claim3 in, which the. controlmembers.comprise a pair of ratcnets and ,the.interconnecting lmeans maintains Y the teeth .ofrsaidratchets in astaggered relation.

.-5.'.The. inventionset'forth in claim 3 inwhich thefcontrolmembers.comprise a .pair .of cams and the interconnecting means comprises.dilerential gearing.

.1.6. A. ribbon feed. mechanism comp-rising a pair of ribbon spools,means for feeding said spools including@ Deir of vI 'atohet and pawldevices, one foreach spool-; ;xneans for actuating the pawls of saidratchetand pawl .devices including an .oscillatable .armcarrying the,pawls of said devices; a .pair ,of ,eontro1 .members one for each; pawl,each member-,movable from a nav/l.A engaging .tota nawl-.disengasingposition,.means interconneet- 111g Seide-members whereby movement ofeither nremberfao'. pa-,Wlsengag-ing position .causes the other:.iueniber @toi nove to :pawl diseneaeins nestionffmeass .normally Ycompelling .saicl- .members to-:mavo withsaidarm in `its pavvl .drivingmoveeleatslwherebvesaidmembers mammie-she ensascdleefwl-iesnsesedposition andthe disengaged cowl .iaidlseuseeedeositiom and means .todetect eahaastioneisaldribbon. spools-.includinsarresfnsemeeosoperative-.when eitherl ribbon Snoollhecoillsseeheusted-to engage thecontrol member; f erfathe exhausted spooland prevent saidflnembeafsala@moving with saidy ann .to therebyfefieet. Intimsof..-S..1.1ehmem.ber torawl eldgngnim .Mira-Rd Othelxltmber tQPlWl Wgci@ .Fl-:.Theginveeiioasetin; eleim .fide-:Walsh .asseressmarnearelroaeselsead 10 theinterconnecting means comprises means to UNITED STATES PATENTS causesaid cams to move in opposite directions Number Name Date when eitherone is engaged by the arresting 1,075,996 Stickney om 14 1913 means.1,162,689 Edwards et a1. Nov. 30: 1915 GEORGE F- MORRIS- 5 1,865,647Shipley July 5, 1932 2,126,347 Ruttiman Aug. 9, 1938 REFERENCES CITEDThe following references are of record in the file of this patent:

